Among the many medical puzzles about COVID-19 that continue to confound experts: Why does one spouse contract COVID-19 while in many cases the other does not?Why does the African continent have far fewer COVID-19 cases and deaths per capita than the other continents?Why does Singapore have more COVID-19 cases per capita than the U.S. but less than one-tenth the per capita death rate?
#people #years #development #individuals #vaccination #million-people #immune-system #recent-study #early-years #immune-systems
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